"It should be obvious that the most secure option is the one-way hash MD5, which by its very nature, cannot be reversed."

But can be bruteforced using rainbowtables.

More information:

www.antsight.com/zsl/rainbowcrack/

www.rainbowcrack.com

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Link to this comment: http://www.securityfocus.com/comments/infocus/1734/614#614